Most of Gohan's life, you might want to check your math
Goku spent 4 years raiseing Gohan as a baby
Died for a year
Was hospitalized while Gohan went to Namek
Stayed on Yardart for a year
Trained with Gohan for 3 years in prep for the androids
Trained with Gohan for 1 year in the time chamber
Died again for 7 years
Time Goku spent with 18 year old Gohan end of Z: 8 years
Jokes aside Goku is a bad father and husband, but he is a good friend and he treats his family like friends, because this is his saiyan instincts taking over. Saiyans do not have romantic relationships, or care other family member, but they do develop bonds of friendship after battling with and against each other.
Goku does care for his family, but they have the same emotional value as Krillian.

Then explain Goten.